Well this has just started happening recently

i have sex or even when i'm masturbating I can be extremely erect but I have tons and tons of precum... Even has happened that once all the cum have left my penis I then orgasum ..... I'm worried for a couple of reasons... #1: my girlfriend isnt on birth control and if we're having sex and I dont see that this much cum is comming out .. Then im in big trouble! #2 i've beentaking a diet pill for the past 4.5 months called phentermine and i'm not sure if thats the case ether. Also i've been cumming pretty fast but I think it really depends on how I am with the girl i'm with. But also when it comes to having awesome sex when i'm drunk I can last hours...Of hours..Of hours..And never cum ....


Can anyone help me out!??